“I’m not sure we’re on the same page with that concept.”

„Interesting idea. Let’s put it in the backlog for now and come back to it nev—I mean later.“

“That’s not a reasonable [opinion/position/take/xyz] and is going to [cost us money/make us look bad/blow up in our face/etc].”

“Yeah, I don’t know about that”

“This is counter to my current understanding”